Is Peter Griffin autistic?

One episode of “Family Guy” actually dealt with this question to some degree. Peter is a buffoonish character who stumbles through life creating chaos. In the episode in question, he was told by a doctor that he was retarded (the term commonly used now to denote this archaic diagnosis is developmentally challenged or delayed). He was given a pass by society because he was considered mentally challenged. A sign was erected in front of his house to warn motorists of his disability. However, autism was never mentioned. The character does display below average intelligence, but he has none of the other characteristics associated with autism.

Is Paul Ryan’s son autistic?